2018-05-15 03:13:16 +00:00
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE dita PUBLIC "-//OASIS//DTD DITA Composite//EN" "ditabase.dtd">
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2018-05-15 03:50:14 +00:00
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<dita xml:lang="en-GB">
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2018-05-15 03:13:16 +00:00
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<topic id="topic_nfy_byz_5db">
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<title>Primary Key Creation</title>
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<body>
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<p>Generating a primary key uses the <codeph>create_key</codeph> method in a Context. It
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contains multiple arguments and keyword arguments, including: <codeph>userid</codeph>,
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<codeph>algorithm</codeph>, <codeph>expires_in</codeph>, <codeph>expires</codeph>,
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<codeph>sign</codeph>, <codeph>encrypt</codeph>, <codeph>certify</codeph>,
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<codeph>authenticate</codeph>, <codeph>passphrase</codeph> and <codeph>force</codeph>. The
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defaults for all of those except <codeph>userid</codeph>, <codeph>algorithm</codeph>,
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<codeph>expires_in</codeph>, <codeph>expires</codeph> and <codeph>passphrase</codeph> is
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<codeph>False</codeph>. The defaults for <codeph>algorithm</codeph> and
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<codeph>passphrase</codeph> is <codeph>None</codeph>. The default for
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<codeph>expires_in</codeph> is <codeph>0</codeph>. The default for
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<codeph>expires</codeph> is <codeph>True</codeph>. There is no default for
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<codeph>userid</codeph>.</p>
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<p>If <codeph>passphrase</codeph> is left as <codeph>None</codeph> then the key will not be
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generated with a passphrase, if <codeph>passphrase</codeph> is set to a string then that
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will be the passphrase and if <codeph>passphrase</codeph> is set to <codeph>True</codeph>
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then gpg-agent will launch pinentry to prompt for a passphrase. For the sake of convenience,
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these examples will keep passphrase set to <codeph>None</codeph>.</p>
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<p>
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<codeblock id="keygen-1" outputclass="language-python">import gpg
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c = gpg.Context()
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c.home_dir = "~/.gnupg-dm"
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userid = "Danger Mouse <dm@secret.example.net>"
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dmkey = c.create_key(userid, algorithm="rsa3072", expires_in=31536000,
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sign=True, certify=True)
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</codeblock>
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</p>
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<p>One thing to note here is the use of setting the <codeph>c.home_dir</codeph> parameter.
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This enables generating the key or keys in a different location. In this case to keep the
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new key data created for this example in a separate location rather than adding it to
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existing and active key store data. As with the default directory,
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<filepath>~/.gnupg</filepath>, any temporary or separate directory needs the permissions
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set to only permit access by the directory owner. On posix systems this means setting the
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directory permissions to <codeph>700</codeph>.</p>
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<p>The <cmdname>temp-homedir-config.py</cmdname> script in the HOWTO examples directory will
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create an alternative homedir with these configuration options already set and the correct
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directory and file permissions.</p>
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<p>The successful generation of the key can be confirmed via the returned
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<codeph>GenkeyResult</codeph> object, which includes the following data:</p>
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<p>
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<codeblock id="keygen-2" outputclass="language-python">print("""
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Fingerprint: {0}
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Primary Key: {1}
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Public Key: {2}
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Secret Key: {3}
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Sub Key: {4}
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User IDs: {5}
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""".format(dmkey.fpr, dmkey.primary, dmkey.pubkey, dmkey.seckey, dmkey.sub,
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dmkey.uid))
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</codeblock>
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</p>
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<p>Alternatively the information can be confirmed using the command line program:</p>
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<p>
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<codeblock id="keygen-3" outputclass="language-bourne">bash-4.4$ gpg --homedir ~/.gnupg-dm -K
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~/.gnupg-dm/pubring.kbx
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----------------------
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sec rsa3072 2018-03-15 [SC] [expires: 2019-03-15]
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177B7C25DB99745EE2EE13ED026D2F19E99E63AA
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uid [ultimate] Danger Mouse <dm@secret.example.net>
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bash-4.4$
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</codeblock>
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</p>
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<p>As with generating keys manually, to preconfigure expanded preferences for the cipher,
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digest and compression algorithms, the <filepath>gpg.conf</filepath> file must contain those
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details in the home directory in which the new key is being generated. I used a cut down
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version of my own <filepath>gpg.conf</filepath> file in order to be able to generate
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this:</p>
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<p>
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<codeblock id="keygen-4" outputclass="language-bourne">bash-4.4$ gpg --homedir ~/.gnupg-dm --edit-key 177B7C25DB99745EE2EE13ED026D2F19E99E63AA showpref quit
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Secret key is available.
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sec rsa3072/026D2F19E99E63AA
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created: 2018-03-15 expires: 2019-03-15 usage: SC
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trust: ultimate validity: ultimate
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[ultimate] (1). Danger Mouse <dm@secret.example.net>
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[ultimate] (1). Danger Mouse <dm@secret.example.net>
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Cipher: TWOFISH, CAMELLIA256, AES256, CAMELLIA192, AES192, CAMELLIA128, AES, BLOWFISH, IDEA, CAST5, 3DES
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Digest: SHA512, SHA384, SHA256, SHA224, RIPEMD160, SHA1
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Compression: ZLIB, BZIP2, ZIP, Uncompressed
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Features: MDC, Keyserver no-modify
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bash-4.4$
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</codeblock>
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</p>
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</body>
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</topic>
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</dita>
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